Boiler for heating purposes



(No Model.) J" MASON BOILER FOR HEATING PURPO$ES.

No. 259,566. Patented'June 13, 1882.

n. PETERS Photo-Lithographer, Washinginn. D.C.

JOSHUA MASON, OF PATERSON, NEW JERSEY.

BOILER FOR HEATING PURPOSES.

SPECIFICATION-forming part of Letters Patent No. 259,566, dated June 13,1882.

' Application filed February 20, 1882.

To all whom tt may concern:

Be it known that I, JOSHUA MASON, of Paterson, in the county of Passaicand State of New Jersey, have invented certain new and usefulImprovements in Boilers for Heating Purposes, of which the following isa specification.

My invention relates more especially to boilers which are used inconnection with hot-water heating apparatus; and my principal object isto provide a boiler in which only a small quantity of water is incontact with a heatingsurface of comparatively great area, and is keptin very rapid circulation.

To this end my invention consists in the combination, in a boiler, of anupper and a lower hollow annular chamber or head, a series ofwater-tubes connecting and forming separate communications between saidchambers or heads, a series of fire-tubes extending one through each ofsaid water-tubes and through both of said chambers or heads, and formingthe inner surfaces of annular water-spaces in the several water-tubes,and a fire-pot, the products of combustion from which pass upward aroundthe water chambers or heads an d outer or water tubes and through theinner or fire tubes, whereby a great area of heating-surface isproduced. I also preferably combine with the above a fire-pot havingdouble vertical walls, forming a water-space between them, which isconnected by tubes with the lower water chamber or head.

In the accompanying drawings, Figure 1 represents a central verticalsection of a boiler embodying my invention, showing the inner and outertubes in section. Fig. 2 is a similar section in which said tubes arenot sectioned. Fig. 3 represents a transverse section upon the dottedline a b, Fig. 1; and Fig. 4 is a simi lar section upon the dotted line0 d, Fig.2.

Similar letters of reference designate corre sponding parts in all thefigures.

A designates the lower, and B the upper, of two hollow annular waterchambers or heads, placed one above the other at some distance apart,and made of malleable cast-iron, steel,- or other suitable material.These water chambers or heads are connected by a series of outervertical water-tubes, C, and a series of fire-tubes, D, arrangedconcentrically within (No model.)

the said outer tubes. The outer tubes, (3, conmet the upper and lowerwater chambers or heads, A and B, their ends being secured in the upperside of the lower chamber, A, and

in the lower side of the upper chamber, B, in

any suitable manner, preferably by being forced into holes prepared forthem, so as to make awater-tig'ht connection. The inner tubes, D, aresecured in any suitable manner in the lower side of the lowerwater-chamber, A, and thence extend upward through said chamber, theouter pipes, G, and the upper waterchamber, they being secured in theupper side of said npper'chamber. The means preferably employed forsecurin g the inner tubes at their upper ends in the upper side of theupper Wa ter chamber or head, B consists of nuts E, in to which the endsof said inner tubes are forced or screwed, and which are themselvesscrewthreaded externally to fit holes in the water-chamber head. Thekind of nuts which I prefer to employ, and which are here represented,have a thin corrugated portion between the two ends, as claimed by me inLetters Patent No. 153,7 7 6, granted to me August 4, 1874, for therebyany slight difference in longitudinal expansion between the outer tubes,G, and the inner tubes, D, will be compensated for and leakageprevented. The inner or fire tubes, D, form the inner surfaces of theannular water-spaces between the tubes D and the watertubes 0, whichsurround them, and these spaces form separate communications between theupper and lower water chambers or beads, and provide for a circulationbetween said chambers or heads.

F designates a fire-pot provided with a grate, e, and having below it anash-pit, G. The tirepot F, in order to increase the effectiveheating-surface of the boiler, is constructed with double walls, formingawater-space,f, between them, which, by means of tubes 9, is in constantand uninterrupted communication with the lower water chamber or head, A.

H designates an inclosing casing, having at the topa flue, H, for theescape of the products of combustion, and having depending from its topa magazine tube or cylinder, I, through which the fuel is introduced,and which is adapted to retain a large supply for self feeding, as shownclearly in Figs. 1 and 2.

The said magazine passes through the central openings in the annularwater chambers or heads A B, and at the top of the casing is a cap orcover, J, which may be removed for the purpose of introducing fuel orfor cleaning out the inner tubes, D, it being observed that the top ofthe casing H is provided with. holes or openings h opposite the saidinner tubes, as seen in Fig. 1.

K K designate pipes extending respectively from the water-spacefin thefire pot F and from the upper water chamber or head, 13. These pipesprovide for the circulation of hot water from the boiler to and througha radiator or system of radiators and thence back to the boiler. Thewater chambers or heads and the spaces between the inner-and outer tubesbeing filled with water, the products of combustion from the fuel in thefire-pot pass upward around the two annular water chambers or heads,around theexterior of the outer tubes, and through the inner tubes, thusproducing a large area of heating-surface relatively to the amount ofwater contained in the boiler, and a consequently rapid circulationthrough the radiator or radiators which are in connection with theboiler.

What I claim as my invention, and desire to secure by Letters Patent,is-

1. The combination, in a boiler, of an upper and a lower hollow annularwater chamber or head, a series of water-tubes connecting and formingseparate communications between said chambers or heads, a series offire-tubes 2. The combination, in a boiler, of an upper and a lowerhollow annular chamber or head, a series of water-tubes connecting saidchambers or heads, a series of fire-tubes extending through saidwater-tubes and through both chambers or heads, and a fire-pot havingdouble vertical walls, and an intervening water-space arranged below thelower chamber or head and in communication therewith, substantially asspecified.

3. The combination of the water chambers or heads A B, the outer andinner tubes, 0 D, the fire-pot F, having water-spaces f, the tubes g,the casing H, and the magazine or cylinder I, all substantially asspecified.

JOSHUA MASON.

Witnesses WM. J. BUCKLEY, JOHN ToWNBY.

